Obesity has become the major risk factor for chronic diseases globally. According to the World Health Organization, by 2015 more than 700 million people worldwide will be obese. In many OECD countries, half or more of the adult population is overweight or obese. The US has the highest obesity rate among OECD countries. Over 33 per cent of the US population is obese.
The continuing upward trends of high obesity rates pose a serious threat of increasing health expenditure among the OECD countries. The main cause of obesity and overweight is imbalanced diet and lack of physical activity. Over consumption of high energy foods and reduced physical activity has caused calories intake more than calories burned. Excess energy are stored
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